Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be8952b2fea19fd…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 10:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 65ae6b54a345864f4d84396e4fc1a050 SHA-1: d9536500b72e9ca4f832fc6af9f54b90045bbfcd SHA-256: 1be8952b2fea19fdbf9032783f830fef49f0356e05a9db9fe24fc2693476837b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://barrybusiness-crm.com/ressource/devis-photo/files/38069276527.pdf In PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/rizipixe.pdfIn PDF document text
    • http://charivne.info/images/file/jorilosonejuzarulalas.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/wewobak.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/71293960333.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/lulowezamojoroguw.pdfIn PDF document text
    • http://poliinc.com/upload/files/28259421855.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143675a9de3e---41526598436.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/16279694382.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9db49be04---35405583989.pdfIn PDF document text
    • http://czminghe.com/upload/files/lavunujalemiso.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161371a7faf9a7---58745191127.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/vesukixebuvowu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/lokerovudefised.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161449be417f63---93283443043.pdfIn PDF document text
    • http://marine-inox.com/i/File/63793024371.pdfIn PDF document text
    • https://eslms.com/userfiles/file/36135236870.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/88471ddfdda88da15dc5d5b95a55fe0c/xuzarizekewimobufakumi.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/8939479714.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210927060817.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/44840122849.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/27573738431.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/4e19b78cc4f8b85c0894c175decfcece/21895642508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=free+thanksgiving+wallpaper+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B3 11000 bytes
SHA-256: 7814a9b7bfd52f079b2c9962f6717892f9c6421f41beff08be7880dd3cab218f
font_01_sfnt_off0000cafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFE 14996 bytes
SHA-256: f67327c9528c0d47fa7a122891e02cb924aa063c82df9402d63a44c6b0cd0a0f
font_02_sfnt_off0000f0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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